How do seismic waves help scientists understand Earth's layers? Select the two correct answers.
Understand the Problem
The question is asking how seismic waves assist scientists in understanding Earth's layers, specifically which two statements about their behavior are accurate.
Answer
1. Seismic waves change speeds through layers. 2. Some waves cannot pass through certain layers.
The two correct answers are: Scientists can observe which seismic waves cannot pass through certain layers, and Scientists can observe how seismic waves change speeds when passing through different layers.
Answer for screen readers
The two correct answers are: Scientists can observe which seismic waves cannot pass through certain layers, and Scientists can observe how seismic waves change speeds when passing through different layers.
More Information
Seismic waves help reveal Earth's internal structure by indicating areas with solid and liquid compositions, reflected by their speeds and the inability of S-waves to pass through liquid layers.
Tips
A common mistake is assuming all waves behave the same in every layer or that only speed changes matter. Different waves interact differently with the Earth’s layers.
Sources
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